A pilot study comparing in-person and web-based motivational interviewing among adults with a first-time DUI offense

Table 2 Differences in within-group outcomes between baseline and follow-up

Variable	UC				In-person MI				Web-MI
Variable	Difference (SD)	Test stat*	d ⁺	p	Difference (SD)	Test stat*	d ⁺	p	Difference (SD)	Test stat*	d ⁺	p
Negative consequences (SIP)	3.82 (8.81)	186.50	0.46	0.013	3.24 (6.10)	233.00	0.29	0.001	3.20 (5.86)	326.50	0.32	<0.0001
Alcohol use # of days	2.63 (19.12)	35.50	0.11	0.474	3.54 (17.49)	66.50	0.12	0.132	4.58 (14.30	126.50	0.19	0.036
# Drinks on typical occasion	0.61 (1.97)	111.50	0.27	0.049	0.82 (2.10)	115.50	0.43	0.014	1.08 (3.33)	143.00	0.33	0.011
Heavy drinking # of days	2.03 (15.46)	40.00	0.16	0.442	1.70 (10.90)	69.50	0.09	0.218	0.61 (13.21)	24.00	0.05	0.742

* Wilcoxon signed rank test for continuous variables
⁺Effect size is computed as Cohen’s d: difference/within-group baseline standard deviation

ISSN: 1940-0640